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[klawr-uh-neyt, klohr-] /ˈklɔr əˌneɪt, ˈkloʊr-/
verb (used with object), chlorinated, chlorinating.
  1. to combine or treat with chlorine.
  2. to introduce chlorine atoms into an organic compound by an addition or substitution reaction.
to disinfect (water) by means of chlorine.
Metallurgy. to treat (a gold ore) with chlorine gas in order that the gold may be removed as a soluble chloride.
Origin of chlorinate
First recorded in 1855-60; chlorine + -ate1
Related forms
chlorination, noun
chlorinator, noun
hyperchlorination, noun
postchlorination, adjective
unchlorinated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for chlorination
Historical Examples
  • Such a comparison shows the superiority of the chlorination method.'

  • No apology is necessary for the publication of a book on the chlorination of water.

    Chlorination of Water Joseph Race
  • The chlorination experiments of the latter were reported by Kellerman, Pratt, and Kimberly.

    Chlorination of Water Joseph Race
  • This acid, on chlorination at low temperatures, yields p-sulphondichloraminobenzoic acid (halazone).

    Chlorination of Water Joseph Race
  • chlorination, by decreasing the load on filter beds, has enabled the rate of filtration to be increased in some cases.

    Chlorination of Water Joseph Race
  • One of the most conclusive experiments as to the beneficial effect of chlorination is that reported by Young of Chicago.

    Chlorination of Water Joseph Race
  • These results demonstrate in a most striking manner the beneficial effect of chlorination.

    Chlorination of Water Joseph Race
  • The efficacy of chlorination to prevent and check epidemics of water-borne typhoid has never been doubted.

    Chlorination of Water Joseph Race
  • Every system of water purification has its limited sphere of utility and chlorination is no exception to the rule.

    Chlorination of Water Joseph Race
  • Their chlorination works, the largest in the world, were putting through 1500 tons per week.

    Getting Gold J. C. F. Johnson
British Dictionary definitions for chlorination


verb (transitive)
to combine or treat (a substance) with chlorine
to disinfect (water) with chlorine
Derived Forms
chlorination, noun
chlorinator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for chlorination

1854, noun of action from chlorinate (v.).



1836 (implied in chlorinated), from chlorine (n.) + -ate (2). Related: Chlorinating.

Online Etymology Dictionary, © 2010 Douglas Harper
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chlorination in Medicine

chlorinate chlo·ri·nate (klôr'ə-nāt')
v. chlo·ri·nat·ed, chlo·ri·nat·ing, chlo·ri·nates
To treat or combine with chlorine or a chlorine compound.

chlo'ri·na'tion n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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chlorination in Science
To add chlorine or one of its compounds to a substance. Water and sewage are chlorinated to be disinfected, and paper pulp is chlorinated to be bleached.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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